柯林斯词典hairpin /ˈhɛəˌpɪn/ (hairpins) 1. N-COUNT A hairpin is a thin piece of metal wire bent back on itself which someone uses to hold their hair in position. 发卡2. N-COUNT A hairpin is the same as a . 同hairpin curve 返回 hairpin剑桥词典a thin , U-shaped metal pin that is used to hold part of the hair in a suitable position （U 形）发卡，发夹 返回 hairpin